I agree with all but the Date. I already know metric measurements and celsius, but changing the order of the date would confuse the hell out of me. It makes more since the American way because it's ordered how you would say it, you say "December 21st, 2012" not "21st of December 2012" or anything like that... as far as I know anyway.
Anyway it's not really that big of a deal. The conversion is not difficult and if you can't do it I'm sure there's an app for it